(19)
(11) EP 0 784 408 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
16.08.2000 Bulletin 2000/33

(43) Date of publication A2:
16.07.1997 Bulletin 1997/29

(21) Application number: 96402262.8

(22) Date of filing: 24.10.1996
(51) International Patent Classification (IPC)7: H04N 7/50
(84) Designated Contracting States:
DE FR

(30) Priority: 11.01.1996 JP 342396

(71) Applicant: FUJITSU LIMITED
Kawasaki-shi, Kanagawa 211-8588 (JP)

(72) Inventors:
  • Nakagawa, Akira, Fujitsu Limited
    Kawasaki-shi, Kanagawa 211 (JP)
  • Kazui, Kimihiko, Fujitsu Limited
    Kawasaki-shi, Kanagawa 211 (JP)
  • Morimatsu, Eishi, Fujitsu Limited
    Kawasaki-shi, Kanagawa 211 (JP)

(74) Representative: Joly, Jean-Jacques et al
Cabinet Beau de Loménie 158, rue de l'Université
75340 Paris Cédex 07
75340 Paris Cédex 07 (FR)

   


(54) Video encoder and decoder


(57) A moving image coding apparatus, a moving image decoding apparatus and a moving image coding-decoding apparatus suitable for use when a moving image is compressed and transmitted have a prediction error signal generating means (1) for dividing an inputted image into blocks each consisting of plural pixels and computing a difference between the inputted image and a predicted image generated from a past inputted image to generate a prediction error signal, an amplitude modulating means (2) for conducting amplitude modulation on an amplitude of each pixel of the prediction error signal at a predetermined modulation factor, a transforming means (3) for transforming the prediction error signal having been undergone amplitude modulation in order to remove correlation among the pixels to generate a transform coefficient, a quantizing means (4) for quantizing the generated transform coefficient, and a channel coding means (5) for assigning a code to the quantized transform coefficient and outputting it, whereby a visually prominent error can be decreased over an entire block when the moving image is coded and decoded.






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